Double-plunger pump.



PATENTED NOV. 17, 190s.

R. ADDISON. DOUBLEv PLUNGER PUMP.

APPLIGATIO HLED 1720.9, 1902.

2 sums-SHEET 1.

NO MODEL.

PATDNTDD Nomina-903. R. ADDISON. y v DOUBLE PLDNGDB, PUMP. APPLIGATION FILED DEQ. 9, 19Q2.

2 SHEETS-SHEET 2.

NO MODEL.

' Ilm" Ill.

No. 744,272. Y atented November 17, 1903.

UNITED STATES PATENT OFFICE.

ROBERT ADDISON, OF PASADENA, CALIFORNIA, ASSIGNOR TO LINDSAY it ADDISON FOUNDRY AND MACHINE WORKS, OF POMONA, CALIFORNIA, A CORPORATION OF CALIFORNIA.

DOUBLE-PLUNGER PUMP.

SPECIFICATION forming part of Letters Patent No. 744,272, dated November 17, 1903.

Application filed December 9. 1902. Serial No. 134,548. (No model.)

To all whom, it may concern..- rection of the arrow, Fig. I, the nearest ver- Be it known that I, ROBERT ADDISON, a cititical timber being removed, together with the zen of the United States, residing at Pasanearest guide-rod. Fig. III isa detail of a dena, in the county of Los Angeles and State portion of the shrouded gears. Fig. IV is a of California, have invented a new and useplan view of the gearing and supporting 55 ful Improvement in Double-Plunger Pumps, means.

of which the following is a specification. l designates a framework, preferably of My invention relates particularly to the timber, which may be formed of a pair of vergearing or driving mechanism of the pump, tical posts, secured to the top of which are :o and has for its object to produce Va gearing cross-timbers 2. 60

which is strong, equably supported, and relaf 3 designates cast-iron frames, which are artively noiseless in action. ranged opposite each other and mounted upon An object of myl invention is to provide the timbers 2. The upper end of each frame means whereby the strain caused by the 3 is provided with a journal 4. Mounted be- |5 weight or pull of the plungers and attached tween the frames 3 are three gears, the two 65 parts upon the main gears is partly taken'off outside gears being designated 5 and the midby the shafts supporting the main gears and dle gear being designated 5a. also to provide means whereby the twisting The gears are provided with.. shafts 6, and cramping effects are equalized, the strain which are mounted in opposite bearings 4 of 2o being counterbalanced and the stress being the frames 3.

distributed at eight points, the gears meshing A pair of driving-pinions 7, mounted on a at six different points. In this embodiment shaft 8, mesh with one side 0f the gears 5, the main or crank gears are triple and cowhile the shaft 8 is carried in suitable jouraxial, and the middle gear is provided with nals in the frame 3. 7a designates another annular bearing-faces or shrouds and which driving-pinion,whichisintermediate the driv- 75 are supported by suitable antifriction devices. ing-gears 7 and is also carried by the shaft 8.

In this embodiment shrouded pinions are ar- 9 designates a pair of idler-pinions, which ranged on opposite sides of the main gears are mounted on a shaft l0, the shaft l0 beand at points somewhat below a horizontal ing mounted on suitablejournals on the frame 3o line drawn through theaxisof the main gears., 3. Intermediate of the idler-pinions 9 is a 8o so that the mainor crank gears are locked to pinion 9a, which meshes with the gear 5a. prevent upward jumping by the pinions.. The gear 5a is shrouded-that is, provided Thus the upward strain of the main gears is with opposite annular bearing-faces 5b. The not wholly carried by the journals which supperipheries of these hearing-faces register port the main shaft, as the pinions serve to with the pitch-line of the gear-teeth. The 85 lock or hold the main gears down in position. driving-pinion 7a is also shrouded, being pro- By the improved mechanism which I provided with opposite annular bearing-faces 7b, vide it is possible to construct the gears of the peripheries of the bearing-faces 7b regiscast-iron and secure an action of the gears tering with the pitch-line of the pinion-teeth.

4o which is practically as still and smooth run The pinion 9a is likewise shrouded, being pro- 9o ning as gearing in which the teeth are c'ut by vided with bearing-faces 9b similar to the pinmore expensive process, as by milling o r using ion 7 a. planer-cut teeth. l Referring to Figs. I and III, it will be ob- Referring to the drawings, Figure I is aserved that the peripheral bearing-faces 5b of side elevation of my invention with the nearthe gear 52L rest upon the peripheral bearing- 95 est supporting-frame and nearest gear refaces 7b of the driving-pinion 7a and upon the moved. One of the timbers which supports peripheral bearing-faces 9b of the shrouded the cast-iron framework is also removed, the pinion 9a, and inasmuch as the distance berim of the gear being in section. Fig. II is a tween the center of the pinions 7 and 9a is 5o side elevation looking at the device in the diless than the diameter of the gear 5 the roo weight of the latter' is partially carried by said pinions, and the crank-gears are locked by the pinions-that is, they are prevented from jumping up.

Fig. III very clearly shows the manner in which the annular peripheral bearing-faces contact.

A pulley may be mounted on the shaft 8 for driving the same.

12 is a crank-pin carried by the gears 5 and 5, while 13 is a crank-pin carried by the gears 5 and 5a and arranged diametrically opposite the crank-pin 12.

14 and 15 designate pitmen, the pitman 14 actuating the plunger 16, the pitman 1.5 actuating the plunger 17. The pitman 15 is connected at its upper end to the crank-pin 12, while the pitman 14 is connected at its upper end with the crank-pin 13.

1S designates guide-rods, which are supported by suitable brackets 19, carried by the timbers.

2O is a cross-head slidably mounted on the guide-rods 18 and connected to the pitman 15.

21 is a cross-head slidably mounted on the guides 18 and connected to the pitman 14.

In operation the three driving-pinions 7, 7, and 7 transmit motion to the gears 5, 5, and 5, the latter gears operating the plungers 16 and 17 through the medium of the pitmen 14 and 15. The middle gear 5 is supported by reason of its annular bearing-faces rolling upon the annular faces of the middle driving-pinion 7a and upon the annular bearing-faces of the middle idler-pinion 9 and is held to its axis of rotation by the locking action of the pinions, as before explained. The friction between these bearing-faces is such that backlash and rattling of the gears is avoided and the gears run smooth and evenly. The strains on the gears 5, 5a, and 5 are distributed,part being carried by the shafts 6 and part by the pinions and bythe shafts 8 and 10. The two sets of pinions might both be considered as driving-pinions, in that both sets really drive the crank-gears. For instance, assuming that there might be some inequality in the teeth of the center driving-pinion, whereby the center driving-pinion failed to contact the driving-faces of its teeth with the teeth of the center crank -gear, the power would be transmitted through one or both of the two outside crank-gears to the outside idler-pinions, and from the shaft of the latter gears the middle idler-pinion would derive power and drive the middle crankgear. This driving action of the idler-gears would take place in other combinations if either of the other drivin g-pinions failed to make good contact.

Having described my invention, what I claim, and desire to secure by Letters Patent of the United States, is-

1. In a double-plunger pump, the combination of a frame, three crank-gears mounted thereon, a set of driving-pinions mounted on the frame and meshing wit-h the crank-gears,

the middle crank-gear being provided with an annular smooth bearing-face and a crankpin on each side thereof, one of said drivingpinions being provided with an annular smooth bearing-face which bears upon the annular bearing-face of said crank-gears, plungers, and pitmen connecting the plungers and crank-gears.

2. In a double-plunger pump, the combination of a pair of frames, a plurality of crankgears, two of said crank-gears being pivotally connected to the frames, two sets of pinions meshing with the crank-gears, the middle pinions in each set meshing with the middle crank-gear, the middle crank-gear being provided with annular bearing-faces, and the middle pinions being provided with annular bearing-faces, said faces of said pinions bearing against the faces of said middle crankgear and supporting the same, plungers, and pitmen connecting the plunger-s and crankgears.

3. In a double-plunger pump, the combination of a pair of frames, a set of crank-gears mounted thereon, two sets of pinions below the axis of said cran k-gears and meshing with the crank-gears, the distance between the centers of the shafts of said two sets of pinions being less than the diameter of the crankgears.

4.. In a double-plunger pump, the combination of a pair of frames, three crank-gears, two of which are pivotally mounted on sai"d frames, the middle crank-gear being connected with the two outer crank-gears by crank-pins, means for supporting said middle gear embracing a driving-pinion and an idler-pinion both of which are mounted on said frames and both being provided with annular smooth bearing-faces which contact with the annular smooth bearing-faces on the middle crank-gear, plungers, and pitmen connecting the plungers and crank-gears.

5. In adouble-plunger pump, the combination of a pair of opposite frames, three crankgears between said frames, a set of drivingpinions meshing with said crank-gears, a set of idler-pinions meshing with said crankgears, the distance between the centers of the shafts of said pinions being less than the diameter of the crank-gears, two plungers, a pitman connecting one plunger with the middle crank-gear and an outside crank-gear, another pitman connecting the other plunger with the middle pinion and the opposite outside gear, the connections of said pitmen to the gears being at points which are diametrically opposite.

ln testimony whereof I have signed my name to this specification, in the presence of two subscribing witnesses, at Los Angeles, in

' the county of Los Angeles and State of California, this 29th day of November, 1902.

ROBERT ADDISON. Witnesses:

G. T. HACKLEY, JAMES R. TowNsEND.

ICO

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